Value Collection 580689PR Machine Screw 1/4-20 Flat Head

Product Description

The VALUE COLLECTION 580689PR is a 1/4-20 x 4-1/2 inch overall length flat head slotted machine screw manufactured from Grade 2 steel with a zinc finish. Designed for use in general-purpose mechanical and structural fastening applications, this screw follows Unified National Coarse (UNC) thread standards. The flat head profile sits flush with or below the mating surface when countersunk, making it suitable for applications where a low-profile fastener is required. The zinc coating provides basic corrosion resistance in dry to mildly humid environments. Installed with a standard flat-blade screwdriver or slotted bit driver.

This machine screw is suited for light-duty to medium-duty assemblies across mechanical, electrical enclosure, HVAC equipment panel, and general fabrication applications. The 1/4-20 UNC thread is one of the most widely used inch-series thread standards, compatible with standard 1/4-20 threaded inserts, nuts, and tapped holes found in equipment frames, junction boxes, and structural brackets. The full 4-1/2 inch overall length accommodates thicker material stacks or assemblies requiring extended thread engagement.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard inch-series hardware
• 4-1/2 inch overall length suitable for thick material stacks and deep assemblies
• Flat head countersunk profile for flush or below-surface installation
• Slotted drive accepts standard flat-blade screwdrivers and bits
• Grade 2 steel construction for general-purpose mechanical strength
• Zinc finish provides basic corrosion resistance in dry to mildly humid conditions

Compatibility

Designed as a general-purpose inch-series machine screw compatible with standard 1/4-20 UNC tapped holes, threaded inserts, and hex nuts used in mechanical assemblies, equipment panels, and fabricated steel components.

Installation Notes

Install using a properly sized flat-blade screwdriver or slotted bit driver to avoid cam-out and head damage. Ensure the receiving hole is tapped to 1/4-20 UNC or fitted with a matching threaded insert before driving. For countersunk installations, the mating material should be drilled and countersunk to the correct flat head angle prior to fastener insertion. De-energize any electrical equipment and follow applicable safety lockout procedures before accessing panels or enclosures secured by these fasteners.